1688 Cable loom clip???? I'm sure I've seen it somewhere.
1690 Aluminium heatsink for some semiconductor. Thyristor ? Prolly 60's /
1692 Switch sequencer, driven by "clock" motor seen on RHS. Programmed by
pegs placed in the drum.
Thanks Rob, keep it up. :)
1687 - Folding rule, not sure what it was used for though with that
1688 - Cable loom clip
1689 - Part of a feather board for a saw/router/shaper. Holds the board
from kicking back.
1690 - Heat sink. From a very early semiconductor.
1692 - Sequential switch. Not sure what it's from but it could be for
lights or a display controller.
1687 - Folding rule, obviously, but for some specialized purpose;
possibly it has a draft scale for pattern making (for cast iron or other
similar cast metals)
1688 - This looks somewhat familiar, but I'm not quite sure where.
Possibly it's a holder for a (rather large) lavaliere microphone, to be
clipped onto one's attire. The microphone capsule, of course, would be
held in the circular portion. It could also be a clip for some other
arbitrary use, like holding sunglasses on a car visor when they're not
1689 - Probably a (part of) a featherboard, used with a table saw or
related tool to prevent wood from kicking back. The pictures show it
upside-down from its usual application.
1690 - Heat sink for a large (older) power transistor or other
1691 - Possibly a tool to apply feet or ferrules to the ends of canes,
chair or table legs, etc.?
1692 - Timer/controller from some piece of equipment; I'd guess it's for
a "motion" sort of advertising light, and the big drum rotates at 1 rpm,
making each numbered division one second. The sequence seems to be
programmable by installing and removing the little black plastic bits on
the drum. Contact 'S' looks like it was overloaded...
Now to read other guesses.
"He is no fool who gives what he cannot keep to gain that which he cannot
On Thu, 06 Aug 2009 16:27:17 -0500, Lloyd E. Sponenburgh wrote:
Actually, it's for forced air. If it was liquid-cooled, it'd be a block
with tubes bonded to or embedded in it.
That hole configuration was used many, many, many years ago for high-
power germanium transistors. The hole in the middle accepts a stud
that was integral with the package, and the other three are emitter,
base, and collector, not necessarily in that order.
Hope This Helps!
Well, Rich, no... I have worked on similar-looking 'sinks that held
stud SCRs with the whole affair immersed in a tank of silicone oil. (Old
EMI CAT machines)
In fact, there's a PC on the market (for high-end gaming) that floods
the entire chassis with oil, for a similar effect.
Posting from rec.crafts.metalworking as always.
1687) At first glance, a folding carpenter's rule, but a closer
look suggests that it is for navigation with maps.
1688) A clip-on paper guide -- perhaps for an inkjet printer
or something similar.
1689) This looks like an anti-kickback guide for a wood saw, except
that either the photo is reversed, or it was photographed from
The fingers allow the workpiece to slide towards the blade, but
if the blade jams in the work and tries to kick it back towards
the operator, the fingers will bite in and hold it in position.
1690) A heatsink for a single transistor -- of the old doorknob
style. I forget the TO-? number, but it was one of the early
power transistor styles. The design suggests that it is cast,
and then just machined flat where the transistor contacts it
(through a possible insulating mica and some silicone based
The shape suggests to me that it was probably from a car radio,
and likely one from before stereo was common.
1691) Hmm ... an interesting thing -- and it looks as though there
were multiple sources of illumination or multiple reflections
from a display case, ad the shadows are showing up in multiples
in some places.
I think that there should be a belt which goes from the tapered
block down under the end, and back up to the lever operated
winch on the other side to pull the workpiece (which looks
somewhat like a spoke from a wagon wheel) to allow drilling or
shaping the upper end.
1692) A drum encoder switch. 19 circuits individual switched by
the black dots in the drum's slots. It is turned by an old
electric clock style of synchronous gear motor, and I would
guess that it provides one rotation of the drum every 24 hours,
to switch on and off things like room lights, or to ring bells
in up to 19 rooms at half-hour increments.
No -- perhaps not half hour increments, alternating (even) hours
are not listed, and it looks as though it may either duplicate a
second time around the drum, or go up to 48 or 50 positions.
The letters above the switch fingers are not to indicate letters
being sent, but rather to identify the fingers, using a scheme
similar to those on connector pins, where letters likely to be
mistaken for others are dropped. Here, we are missing 'I', 'O',
'Q', and there is no need for 'X', 'Y', and 'Z', as all the pins
are already accounted for.
Now to see what others have suggested.
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