Another useful clamp, though far more complicated in its structure, is that of Professor McGill (Fig. 88).

The manor house has a tremendous nail-studded oak door, which is barred at night by ponderous clamps of iron and many other contrivances; but the old-fashioned windows could be opened by any moderately skilful burglar in half a minute.

Upon a movable barrel A, a piece of paper is wound, the ends of which are secured by the slight brass clamps shown in the drawing.

First he heard the slow clamp-clamp of ascending foot-steps.

As will be seen from the engravings, the new conveyer consists simply of a spiral of round steel rod mounted upon a quickly revolving spindle by means of suitable clamps and arms.

The use of S-shaped thin steel clamps to prevent large checks and splits is now a common practice in this country with crossties and poles as it has been for a long time in European countries.

The whole is secured to the head of the patient by a single chin-strap, and connection established with an ordinary galvanic battery by means of an appropriate clamp and insulated cord.

by ½ in., and is held vertically by means of studs riveted into the side; these studs pass through porcelain insulators, and by means of wooden clamps and wedges are held in the iron chairs which rest upon the sleepers.

Then at last, deep in the clammy earth they reached a door, a small door whose rusted iron was handed with mighty clamps of rusted iron.