Abstract: A support for a dry erase marker and eraser for wiping writing medium of such a marker from a writing surface includes a stopper having a load bearing end face opposite from a connector surface. The connector surface is engagable with an end of the dry erase marker which is opposite a dispenser for the wipeable marker medium. A layer of pile material is supported by the load bearing end face for wiping writing medium from the writing surface while retained and supported by the housing from a ledge forming a generally horizontal support surface protruding from a writing surface. A layer of hook material is adhered to the horizontal ledge. The layers of hook and pile material are sufficiently interconnected upon contact there between to support the dry erase marker from the ledge so that the influence of gravity acting on a dry erase marker maintains the dispenser wet with writing medium.

Abstract: An apparatus and method for securely holding a trash or garbage bag is provided. Said device comprises a base support frame, a rectangular shaped frame, and rotatable connecting means for connecting the two. The method comprises inserting the frame into the open end of a trash bag and rotating the rectangular shaped frame so as to securely hold the trash bag.

Abstract: This discloses an improved side-scan sonar capable of locating objects on e ocean floor including the strip directly beneath the sonar transmitter and receiver, which in prior arrangements had to be obtained by another pass. The arrangement includes a platform having acoustic transmitters spaced apart a substantial distance on either side of acoustic receivers. The transmitter on the right directs its acoustic output to the left and the transmitter on the left directs its acoustic output to the right for increased shadow forming and enhanced detection by the receiver of objects of height directly beneath the receiver.

Abstract: A pulsed laser beam aiming apparatus is configured such that substantially 00% of the energy from a pulsed laser beam from a Q-switched pulsed laser device is accurately aimed at a distant target/obstacle in space. The pulsed laser beam is reflected off of a multifaceted polygonal mirror spinning about its axis and perpendicularly affixed to a rotatable azimuthal table wherein the spinning mirror provides elevational orientation, and, in conjunction with the rotatable azimuthal table, azimuthal orientation. Control circuit and associated equipment cause the Q-switched pulsed laser device to be triggered on when a facet of the mirror is in the proper elevational and azimuthal orientation for the pulsed laser beam to hit the target/obstacle. Correct aiming of the pulsed laser beam at the target/obstacle is accomplished when the coordinates thereof are specific only as an elevational angle .+-.5 above and/or below the horizon and an azimuthal angle between 0.degree. and 360.degree..

Abstract: A laser intrusion system incorporating a relatively long wavelength infra-red laser, a beam path, a quantum amplifier, a detector, and associated optical and electronic components is described. The relatively long wavelength of the laser radiation and the high gain and narrow bandwidth of the quantum amplifier make the system relatively immune to environmental conditions such as fog and rain and particularly applicable for long range, all-weather, outdoor use.