
Figure 1 shows a machine; made by Loyd A. Magruder, 800 Ashman St., Sault Ste. Marie, Mich. It has direct gear drives and is of all-iron construction, made, as Magruder points out, largely of junk and with very few tools. The stand consists of two old auto flywheels bolted to legs sawed from old auto frames. The oscillating cross member is driven from two crank arms, one of which shows in profile. The rest is a matter of gearing. Possibly, as someone has pointed out, the bevel gears and pinions could be backed up more closely with bearings, to get away from flexure and chatter, yet the actual forces involved in working a small mirror are rather low and the proof of the pudding is that this machine has been a success.
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